Contents of Volume XVIII 



NUMBER I 



PAGE 



The Nitrate Deposits or Chile. R. F. A. Penrose, Jr. . . i 



Glaciation on the North Side of the Wrangell Mountains, 



Alaska. Stephen R. Capps ....... 33 



The Calculation of the Norm in Igneous Rocks. George I. 



Finlay ........... 58 



The Occurrence of a Sauropod Dinosaur in the Trinity Cre- 

 taceous of Oklahoma. Pierce Larkin 93 



Reviews 99 



NUMBER II 



Succession and Range of Mesozoic and Tertiary Floras. F. H. 



Knowlton .......... 105 



Certain Valley Configurations in Low Latitudes. T. C. Cham- 



berlin and R. T. Chamberlin . . . . . . . 117 



The Anthracolithic or Upper Paleozoic Rocks of Kansas and 



Related Regions. Charles S. Prosser 125 



The Form of Nantasket Beach. Douglas Wilson Johnson and Wil- 

 liam Gardner Reed, Jr. . . . . . . .161 



The Age of the Earth and the Saltness of the Sea. H. S. Shelton 189 



Reviews 193 



NUMBER III 



Correlation of the Cenozoic through Its Mammalian Life. 



Henry Fairfield Osborn . . . . . . . .201 



The Geologic Record of California. James Perrin Smith . . 216 



